英语4.I need one more stamp before my collection ________.4.I need one more stamp before my collection ________.a.has completed b.completes c.has been completed d.is completed 为什么

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英语4.I need one more stamp before my collection ________.4.I need one more stamp before my collection ________.a.has completed b.completes c.has been completed d.is completed 为什么
英语4.I need one more stamp before my collection ________.
4.I need one more stamp before my collection ________.
a.has completed b.completes c.has been completed d.is completed
为什么

英语4.I need one more stamp before my collection ________.4.I need one more stamp before my collection ________.a.has completed b.completes c.has been completed d.is completed 为什么
D
一般的被动时态

D
就是说在完成前还需要1张邮票,一般现在时就行,而且应该是被动

d